HV: init and sanitize acrn multiboot info

Initialize and sanitize a acrn specific multiboot info struct with current
supported multiboot1 in very early boot stage, which would bring below
benifits:

- don't need to do hpa2hva convention every time when refering boot_regs;

- panic early if failed to sanitize multiboot info, so that don't need to
  check multiboot info pointer/flags and panic in later boot process;

- keep most code unchanged when introduce multiboot2 support in future;

Tracked-On: #4419

Signed-off-by: Victor Sun <victor.sun@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

hypervisor/boot/include/guest/vboot.h

@@ -26,6 +26,5 @@ uint64_t get_ap_trampoline_buf(void);
 void *get_rsdp_ptr(void);
 
 enum vboot_mode get_sos_boot_mode(void);
-void parse_hv_cmdline(void);
 
 #endif /* end of include guard: VBOOT_H */